Around 300 Labor faithful have turned out in south-western Sydney for the party's state election campaign launch.

Prime Minister Julia Gillard kicked off the low-key event, under the "fairness for families" banner in the auditorium of the Western Suburbs Leagues Club in Leumeah.

She told the crowd New South Wales cannot afford a Liberal government.

"The contrast with our opponents in this election couldn't be clearer," she said.

"Labor is a party with a practical positive plan to help. Six days to go and the Liberal policy is hide and seek.

"Don't give [Opposition Leader] Barry O'Farrell a blank cheque. Don't let Barry O'Farrell do whatever he wants. Let's remember the last time a Liberal government could do whatever it wanted, we ended up with WorkChoices."

Ms Keneally used the event to unveil her education policy, promising 750 new selective class places for talented students and 100 extra Highly Accomplished Teachers.

A number of retiring Labor MPs are not attending the Leumeah event.

Some are furious that earlier this week at a public forum Ms Keneally said she had shown them "the door". They say they voluntarily chose to retire.

Meanwhile Opposition Leader Barry O'Farrell will mark the final week of the New South Wales' election campaign later today with a promise to fund more police officers and a new helicopter.

Mr O'Farrell is holding an election rally in Tumbi Umbi on the state's central coast, in the electorate of The Entrance, a seat held by Labor that the Liberal Party hopes to win.

He will promise that if the Coalition wins the election it will buy a new $16 million counter-terrorism helicopter and 100 additional police vehicles.

Mr O'Farrell is also pledging to recruit 550 new police officers. One hundred of them will be deployed to the highway patrol.

The Greens say the Coalition has broken its promise not to start a law-and-order auction.